On my first day with the Fut 133, I had the same problem. I moved the back straps from the most outboard site to the next set. In lighter winds, I find I like the back straps in the next to outboard holes, but when really powered up, I now can find and use the outboard setting. However, trying to guess what the wind will bring is tricky. so I leave the back straps a little more inboard, and change if necessary.
good to hear from you with your opinion!